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There are actually levels of Tribalism because when it comes right down to it, that's what it is. It starts out with not believing what someone says, but then if a valid argument is presented, there continues to be disbelief because an individual doesn't want to look disloyal to a group. As the final last stand, an individual will be accused of, as you say, being negative or "Tearing it down." I myself have been accused of being venomous simply because I dare to ask questions or point out things that are wrong. Sadly, in this world, there are a lot of people willing to overlook shortcomings because they don't want to see anything bad said about their club, group, party etc.